Feeding mechanism for sewing-machines



(No Model.)

W. J. STEWART. FEEDING MECHANISM FOR SEWING MACHINES. No. 596,920.

Patented Jan. 4, 1898.

m uwwwaswmaron a c UNITED STATES PATENT @rrrcs.

XVILLIAM J. STEWART, OF CHICAGO, ILLINOIS.

FEEDING MECHANISM FOR SEWlNG-MACHINES.

SPECIFICATION forming part of Letters Patent No. 596,920, dated January 4, 1898.

Application filed N b 8, 1895. Serial No. 568,338. (No model.)

To aZZ whom it may concern:

Be it known that I, WILLIAM J. STEWART, a citizen of the United States, residing a t Ohicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Feeding Mechanism for Sewing-Machines; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specification.

This invention relates to the mechanism for operating the cloth-feeding bar of sewing-machines, and more particularly to that type of such feeding mechanisms in which a gyratory operating shaft or lever is arranged beneath the bed of the machine, with its forward end fulcrumed in a suitable bearing on said bed at a point forward. of the feed-bar and with its rear end connected by link connections with an operating-eccentric on the drivingshaft of the machine, so as to receive a gyratory motion therefrom, such gyratory operating shaft or lever having intermediate connections to the sewing-machine feed-bar, so as to impart the requisite forward-and-back, as well as the up-and-down movement to such feed-bar; and the object of the present improvement is to provide a novel, simple, and eflicient structural arrangement and combination of the parts of such type of feed mechanisms, whereby the same are rendered very efficient in operation, as well as cheap and durable in construction, all as will hereinafter more fully appear and be more particularly pointed out in the claim. I attain such object by the construction and arrangement of parts illustrated in the accompanying drawings, in which Figure 1 is a bottom plan of a sewing-machine illustrating my present improvement; Fig. 2, a transverse section at line a: at, Fig. 1, illustrating the shuttle and feed-operating eccentric and their-connections; Fig. 3, an enlarged detail longitudinal sectional elevation at line o3 at, Fig. 1; Fig. 4, an enlarged transverse sectional elevation at line 00 00 Fig. 3.

Similar numerals of reference indicate like parts in the several views.

As represented in the drawings, the general arrangement of the feec'l-operating mechanism, ($70., will be substantially the same as that shown in my former Letters Patent, No. 460,730, dated OctoberdlSQhandNo. 533,566, dated February 5, 1895.

Referring to such drawings, 1 represents the cloth-feeding bar, which in the construction shown is guided in a slot or groove in the guide-post 2, that projects downwardly from the under surface of the bed 3 of the machine, such feed-bar being fulcrumed by an elongated horizontal slot in its forward end upon a cross-pin at of the guide-post 2, so as to have a horizontal reciprocating movement at its forward end, while its rear end is leftfree to move back and forth, as well as up and down in the operation of the machine.

5 is the gyratory operating shaft or lever, pivoted at a point forward of the feed-bar l in a pendent post 6 on the under side of the bed of the machine, the rear end of such shaft being free to gyrate.

' 7 is an operating link connection similar to that shown in my forinerpatent, No. 533,566, the upper end of which is provided with an eccentric-yoke that embraces the operatingeccentric 8 on the driving-shaft 9 of the machine, while the lower end of such link connection is formed with a tubular eye that engages the spherically-formed rear end of the gyratory shaft or operating-lever 5.

10 is an adjustable sliding block adapted to move in a vertical guide-slot 11 in the ver tical portion of the machine-arm and be held to its required adjustment by a thumb or set screw 12.

13 is the pivot-link connecting the adjustable block 10 to the operating link connection 7, the connection to the said block 10 being by means of a pivot-pin and to the link 7 by means of a sleeve 14, adapted to slide thereon.

As in my former patent, the circle of gyration of the lower end of the link connection 7 in a vertical plane will remain constant regardless of the adjustment of the pivot-link l3, and consequently the up-a-nd-down movement of the feed-bar 1 will remain constant. The gyration of the lower end of the operating link connection '7 in a horizontal plane varies with the adjustment of the pivot-link 13 and its carrying-block 10, increasing as such parts are adjusted upward toward the operating-eccentric 8 and decreasing as such parts are adjusted downwardly away from the eccentric, and accordingly the forward and backward movements of the cloth-feeding bar 1 can be adjusted to suit any required length of stitch without affecting the constant upand-down movement of such feeding-bar.

The novelty of present improvement consists in operating the cloth-feeding bar in its forward and backward movements in a direct feed mechanisms is attained in a very cheap, simple, and effective manner.

Having thus fully described my said inven tion, What I claim as new, and desire to se cure by Letters Patent, is-

A feeding mechanism for sewing-machines, comprising in combination, the cloth-feeding, bar 1, fulcrumed to the bed of the machine, and guided thereon, and provided with a Vertical recess 15 and a forwardly-projecting stud 16, a gyratory operating-shaft 5, journaled on the bed of the machine at a point forward of the feed-bar, and adapted to engage the recess 15 and stud 16, and means for imparting a gyratory motion to the rear end of the shaft 5, substantially as set forth.

In testimony whereof witness my hand this 10th day of September, 1895'.

' \VILLIAM J. .STEIVART.

In presence of ROBERT BURNS, J AMES LAVALLIN. 

